diff --git a/src/UglyToad.PdfPig.DocumentLayoutAnalysis/ClusteringAlgorithms.cs b/src/UglyToad.PdfPig.DocumentLayoutAnalysis/ClusteringAlgorithms.cs
index a60c5411..fa2b4494 100644
--- a/src/UglyToad.PdfPig.DocumentLayoutAnalysis/ClusteringAlgorithms.cs
+++ b/src/UglyToad.PdfPig.DocumentLayoutAnalysis/ClusteringAlgorithms.cs
@@ -313,12 +313,5 @@
             }
             return group;
         }
-
-        public class DfsEdge : Tuple<int, int>
-        {
-            public DfsEdge(int item1, int item2) : base(item1, item2)
-            {
-            }
-        }
     }
 }